HBASE-29667 Correct block priority to SINGLE on the first write to the bucket cache

[Huginn-kio]

HBASE-29667 Correct block priority to SINGLE on the first write to the bucket cache

[Apache-HBase]

🎊 +1 overall

Vote	Subsystem	Runtime	Logfile	Comment
+0 🆗	reexec	0m 12s		Docker mode activated.
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+0 🆗	codespell	0m 0s		codespell was not available.
+0 🆗	detsecrets	0m 0s		detect-secrets was not available.
+1 💚	@author	0m 0s		The patch does not contain any @author tags.
+1 💚	hbaseanti	0m 0s		Patch does not have any anti-patterns.
			_ master Compile Tests _
+1 💚	mvninstall	5m 14s		master passed
+1 💚	compile	4m 20s		master passed
+1 💚	checkstyle	1m 11s		master passed
+1 💚	spotbugs	2m 14s		master passed
+1 💚	spotless	1m 5s		branch has no errors when running spotless:check.
			_ Patch Compile Tests _
+1 💚	mvninstall	4m 30s		the patch passed
+1 💚	compile	4m 14s		the patch passed
+1 💚	javac	4m 14s		the patch passed
+1 💚	blanks	0m 0s		The patch has no blanks issues.
+1 💚	checkstyle	1m 12s		the patch passed
+1 💚	spotbugs	2m 27s		the patch passed
+1 💚	hadoopcheck	14m 0s		Patch does not cause any errors with Hadoop 3.3.6 3.4.1.
+1 💚	spotless	1m 0s		patch has no errors when running spotless:check.
			_ Other Tests _
+1 💚	asflicense	0m 13s		The patch does not generate ASF License warnings.
		50m 22s

Subsystem	Report/Notes
Docker	ClientAPI=1.48 ServerAPI=1.48 base: https://ci-hbase.apache.org/job/HBase-PreCommit-GitHub-PR/job/PR-7399/1/artifact/yetus-general-check/output/Dockerfile
GITHUB PR	#7399
Optional Tests	dupname asflicense javac spotbugs checkstyle codespell detsecrets compile hadoopcheck hbaseanti spotless
uname	Linux 34682606ed31 6.8.0-1024-aws #26~22.04.1-Ubuntu SMP Wed Feb 19 06:54:57 UTC 2025 x86_64 x86_64 x86_64 GNU/Linux
Build tool	maven
Personality	dev-support/hbase-personality.sh
git revision	master / b3a7bd4
Default Java	Eclipse Adoptium-17.0.11+9
Max. process+thread count	70 (vs. ulimit of 30000)
modules	C: hbase-server U: hbase-server
Console output	https://ci-hbase.apache.org/job/HBase-PreCommit-GitHub-PR/job/PR-7399/1/console
versions	git=2.34.1 maven=3.9.8 spotbugs=4.7.3
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[wchevreuil]

Thanks for spotting this and submitting a fix, @Huginn-kio ! It definitely looks like a bug. Can we add a simple UT for this on TestBucketCache? It should simply validate that a BucketEntry gets created with SINGLE priority, then once access() is called, its priority changes to MULTI.